61457789 has 4 divisors (see below), whose sum is σ = 61906524. Its totient is φ = 61009056.

The previous prime is 61457749. The next prime is 61457801. The reversal of 61457789 is 98775416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49589764 + 11868025 = 7042^2 + 3445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61457789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61457719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224162 + ... + 224435.

It is an arithmetic number, because the mean of its divisors is an integer number (15476631).

Almost surely, 2^61457789 is an apocalyptic number.

It is an amenable number.

61457789 is a deficient number, since it is larger than the sum of its proper divisors (448735).

61457789 is a wasteful number, since it uses less digits than its factorization.

61457789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448734.

The product of its digits is 423360, while the sum is 47.

The square root of 61457789 is about 7839.5018336626. The cubic root of 61457789 is about 394.6320110710.

The spelling of 61457789 in words is "sixty-one million, four hundred fifty-seven thousand, seven hundred eighty-nine".